1 Guaranteed (Halo 3) and 3 up in the air.
Call of Duty 4: Modern Warfare 7.52 - With a platnium hits status and if the 360 has a long life span, there may be enough people still buying this game in the long run especially those that got Modern Warfare 2 but never played the first.
Grand Theft Auto IV 7.11 - While It still lags behind San Andreas and what not, GTAIV could make that 10 million mark if it ends up being bundled with the 360 system. Imagine a bundle with GTAIV! Course once it hits $20 we could see more copies fly off the shelves, similiar to GTA3 and San Andreas.
Halo: Reach - Can you say hype? With the right commercials, hype, and gamer fuel theres a good chance it could become a ten million seller in the long run, but it would take a lot of money invested into it to reach such sales status.
It's just that simple.
